<template>
  <div>
             <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
     <!-- 卡片视图区 -->
     <el-card>
         <!-- 头部的警告区 -->
  <el-alert
    title="注意: 只允许为第三级分类设置相关参数"
    type="warning"
    :closable="false"
    show-icon
    >
  </el-alert>

  <!-- 选择商品分类区域 -->
 <el-row class="cat_opt">
     <el-col>
        <span>选择商品分类: </span>
        <!-- 选择商品分类的级联选择框 -->
          <el-cascader
     expand-trigger="hover"
     v-model="selectedCateKeys"
    :options="catelist"
    :props="cateProps"
    @change="handleChange"></el-cascader>

     </el-col>
 </el-row>

 <!-- tab 页签区域 -->
 <el-tabs v-model="activeName" @tab-click="handleTabClick">
     <!-- 添加动态参数的面板 -->
    <el-tab-pane label="动态参数" name="many">
        <!-- 添加参数的按钮 -->
     <el-button type="primary" size="mini" :disabled="isbBtnDisabled" @click="AddDialogVisible=true">添加参数</el-button>
     <!-- 动态参数表格 -->
     <el-table :data="manyTabData" border stripe>
         <!-- 展开行 -->
          <el-table-column type="expand">
      <template slot-scope="scope">
        <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">
                   {{item}}
                  </el-tag>    
                  <!-- 输入文本框 -->
                  <el-input
  class="input-new-tag"
  v-if="scope.row.inputVisible"
  v-model="scope.row.inputValue"
  ref="saveTagInput"
  size="small"
  width="120"
  @keyup.enter.native="handleInputConfirm(scope.row)"
  @blur="handleInputConfirm(scope.row)"
>
</el-input>
<!-- 添加的按钮 -->
<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

      </template>

          </el-table-column>
         <!-- 这是一个所有列 -->
     <el-table-column type="index"></el-table-column>
     <el-table-column label="参数名称" prop="attr_name"></el-table-column>
     <el-table-column label="操作">
         <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">修改</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
         </template>
     </el-table-column>
     </el-table>
    </el-tab-pane>



    <!-- 添加静态属性的面板 -->
    <el-tab-pane label="静态属性" name="only">
        <!-- 添加属性的按钮 -->
            <el-button type="primary" size="mini" :disabled="isbBtnDisabled" @click="AddDialogVisible=true">添加属性</el-button>
                <!-- 静态参数表格 -->
     <el-table :data="onlyTabData" border stripe>
         <!-- 展开行 -->
                  <el-table-column type="expand">
      <template slot-scope="scope">
        <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">
                   {{item}}
                  </el-tag>    
                  <!-- 输入文本框 -->
                  <el-input
  class="input-new-tag"
  v-if="scope.row.inputVisible"
  v-model="scope.row.inputValue"
  ref="saveTagInput"
  size="small"
  width="120"
  @keyup.enter.native="handleInputConfirm(scope.row)"
  @blur="handleInputConfirm(scope.row)"
>
</el-input>
<!-- 添加的按钮 -->
<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

      </template>

          </el-table-column>
         <!-- 这是一个所有列 -->
        <el-table-column type="index"></el-table-column>
     <el-table-column label="属性名称" prop="attr_name"></el-table-column>
     <el-table-column label="操作">
         <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">修改</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini"  @click="removeParams(scope.row.attr_id)">删除</el-button>
         </template>
     </el-table-column>
     </el-table>
    </el-tab-pane>
  </el-tabs>
     </el-card>

     <!-- 添加参数的对话框 -->
     <el-dialog
  :title="'添加'+titleText"
  :visible.sync="AddDialogVisible"
  width="50%"
  @close="addDialogClose"
   >
   <!-- 添加参数的对话框 -->
  <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" class="demo-ruleForm">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="addForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="AddDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
</el-dialog>

 <!-- 修改参数的对话框 -->
 <el-dialog
  :title="'修改'+titleText"
  :visible.sync="editDialogVisible"
  width="50%"
  @close="editDialogClose"
   >
   <!-- 添加参数的对话框 -->
  <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px" class="demo-ruleForm">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="editForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
</el-dialog>
  </div>
</template>

<script>
export default {
   name:"Params",
   data(){
    return{
        //商品分类列表
    catelist:[],
    //级联选择框的配置对象
    cateProps:{
     value:'cat_id',
     label:"cat_name",
     children:"children"
    },
    //级联选择框双向绑定到的数组
    selectedCateKeys:[],
    //被激活的页签的名称
    activeName:"many",
    //动态参数的数据
    manyTabData:[],
    //静态属性的数据
    onlyTabData:[],
    //控制添加对话框的显示隐藏
    AddDialogVisible:false,
    //添加数据的表单数据对象
    addForm:{
      attr_name:""
    },
    //添加表单的验证规则对象
    addFormRules:{
      attr_name:[{
        required:true,message:"请输入参数名称",trigger:"blur"
      }]
    },
    //控制修改对话框的显示与隐藏
    editDialogVisible:false,
    //修改的表单数据对象
    editForm:{},
    //修改表单的验证规则对象
    editFormRules:{}
    }
   },
   created(){
       //获取所有的商品分类列表
     this.getCateList()

   },
   methods:{
     async getCateList(){
        const {data:res} = await this.$http.get("categories")
        if(res.meta.status !==200){
            return this.$message.error("获取商品分类失败")
        }
          this.catelist = res.data 
     },
     //级联选择框选中项变化,会触发这个函数
        handleChange(){
       this.getParansData()
       
       
    
     },
   //获取参数的列表数据
   async getParansData(){
             //证明选中的不是三级分类
       if(this.selectedCateKeys.length !==3){
           this.selectedCateKeys =[]
           this.manyTabData=[],
           this.onlyTabData =[]
      return 
       }
       //证明选择的是三级分类
        //根据所选分类的id,和当前所处的面板,获取对应的参数
      const {data:res} =   await  this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}})
      if(res.meta.status !==200){
          return this.$message.error("获取参数失败")
      }
    
      res.data.forEach(item=>{
       item.attr_vals = item.attr_vals ? item.attr_vals.split(" "):[]
       //控制文本框的显示与隐藏
       item.inputVisible = false
       //文本框输入的值
       item.inputValue = ""
      })
        console.log(res.data)
      if(this.activeName==="many"){
          this.manyTabData = res.data
      }else{
           this.onlyTabData= res.data
      }
    },
     //tab页签点击事件的处理函数
     handleTabClick(){
      this.getParansData()
     },
     //监听对话框的关闭事件
     addDialogClose(){
    this.$refs.addFormRef.resetFields()
     },

     //点击按钮,添加参数
     addParams(){
       //表单的预验证 发起网络请求的时候
       this.$refs.addFormRef.validate(async valid=>{
         if(!valid) return
        const {data:res} =await    this.$http.post(`categories/${this.cateId}/attributes`,{attr_name:this.addForm.attr_name,attr_sel:this.activeName})
        if(res.meta.status !==201){
          return this.$message.error("添加参数失败")
        }
        this.$message.success("添加参数成功!")
        this.AddDialogVisible = false
        this.getParansData()
       })
     },
     //点击按钮展示修改的对话框
   async  showEditDialog(attr_id){
  this.editDialogVisible = true

  //查询当前参数的信息
      const {data:res} =await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{attr_sel:this.activeName})
      if(res.meta.status!==200) {
        return this.$message.error("获取参数失败")
      }
     this.editForm = res.data
     },
     //重置修改的表单
     editDialogClose(){
   this.$refs.editFormRef.resetFields()
     },
     //点击按钮,修改参数信息
     editParams(){
      this.$refs.editFormRef.validate(async valid =>{
        if(!valid) return
     const {data:res} =  await  this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
        attr_name:this.editForm.attr_name,
         attr_id:this.editForm.attr_id,
         attr_sel:this.activeName
        })
        if(res.meta.status !==200){
          return this.$message.error("修改参数失败")
        }
        this.$message.success("修改参数成功")
        this.getParansData()
        this.editDialogVisible =false
      })
      
     },
     //根据id删除对应的参数项
   async  removeParams(attr_id){
    const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',//确定返回字符串confirm
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err=>err)


        if(confirmResult !=="confirm"){
          return this.$message.info("已取消")
        }

        // 删除业务逻辑
      const {data:res} =  await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
      if(res.meta.status !==200){
        return this.$message.error("删除参数失败")
      }
      this.$message.success("删除参数成功")
     this.getParansData()
     },
     //文本框失去焦点或者按下了enter都会触发
     handleInputConfirm(){
       console.log('ok')
       },

       //点击按钮切换至文本框
       showInput(row){
  row.inputVisible = true
  //让文本框自动获得焦点
    //$nextTick 方法的作用,就是当页面被重新渲染之后,才会调用指定回调函数中的代码
   this.$nextTick(()=>{
        this.$refs.saveTagInput.$refs.input.focus()
   })
       },
      async handleInputConfirm(row){
         if(row.inputValue.trim().length===0){
            row.inputValue =""
             row.inputVisible = false
             return
         }
         //如果没有retutn则证明输入的内容需要做后续处理
         row.attr_vals.push(row.inputValue.trim())
        row.inputValue=""
        row.inputVisible= false    
        //需要发起请求保存这次操作
         const {data:res} =  await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
         attr_name:row.attr_name,
          attr_sel:row.attr_sel,
           attr_vals:row.attr_vals.join(" ")
       })           
       if(res.meta.status !==200){
         return this.$$message.error("添加参数项失败")
       }                                              
      this.$message.success("添加参数项成功")     
       },
     
     // attr_vals的操作保存到数据库
async saveAttrVals(row){
   const {data:res} =  await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
         attr_name:row.attr_name,
          attr_sel:row.attr_sel,
           attr_vals:row.attr_vals.join(" ")
       })           
       if(res.meta.status !==200){
         return this.$$message.error("修改参数项失败")
       }                                              
      this.$message.success("修改参数项成功")             
},
       //删除对应的参数和选项
       handleClose(i,row){
         row.attr_vals.splice(i,1)
         this.saveAttrVals(row)
        
       }
     
   },
   computed:{
       //如果按钮需要被禁用,则返回true,否则返回false
    isbBtnDisabled(){
         if(this.selectedCateKeys.length!==3){
             return true
         }
         return false
    },
    //当前选中的三级分类的id
    cateId(){
      if(this.selectedCateKeys.length ===3){
          return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText(){
   if(this.activeName ==="many"){
     return "动态参数"
   }
   return "静态属性"
    } 
   }
}
</script>

<style>
.cat_opt{
    margin: 15px 0;
}
.el-cascader{
    width: 250px;height: 80px;
}
.el-tag {
  margin: 10px;
}
.input-new-tag{
  width: 120px !important;
}
</style>